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| 逐步曝气 | |||
| 阶段曝气; 分段曝气; 分级曝气; 分级曝气法; 阶段曝气法 | |||
| step aeration: 7 phrases in 3 subjects |
| Agriculture | 1 |
| Metallurgy | 1 |
| Technology | 5 |
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